<template>
 <div>
   <el-breadcrumb separator="/">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>添加商品</el-breadcrumb-item>
   </el-breadcrumb>
   <el-card>
     <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
     <el-steps align-center class="bzt" :space="200" :active="activeindex - 0" finish-status="success">
       <el-step title="基本信息"></el-step>
       <el-step title="商品参数"></el-step>
       <el-step title="商品属性"></el-step>
       <el-step title="商品图片"></el-step>
       <el-step title="商品内容"></el-step>
       <el-step title="完成"></el-step>
     </el-steps>
     <el-form label-position="top" :model="addForm" :rules="addFormrules" ref="addformref" label-width="100px">
     <el-tabs  @tab-click="tabclick" :before-leave="beforetableave" :tab-position="'left'" v-model="activeindex">
       <el-tab-pane label="基本信息" name="0">
         <el-form-item label="商品名称" prop="goods_name">
           <el-input v-model="addForm.goods_name"></el-input>
         </el-form-item>
         <el-form-item label="商品价格" prop="goods_price">
           <el-input v-model="addForm.goods_price" type="number"></el-input>
         </el-form-item>
         <el-form-item label="商品重量" prop="goods_weight">
           <el-input v-model="addForm.goods_weight" type="number"></el-input>
         </el-form-item>
         <el-form-item label="商品数量" prop="goods_number">
           <el-input v-model="addForm.goods_number" type="number"></el-input>
         </el-form-item>
         <el-form-item label="商品分类" prop="goods_cat">
           <el-cascader
             v-model="addForm.goods_cat"
             :options="catelist"
             expandTrigger="hover"
             :props="cateprops"
             @change="handleChange"></el-cascader>
         </el-form-item>
       </el-tab-pane>
       <el-tab-pane label="商品参数" name="1">
         商品参数
         <el-form-item :label="item.attr_name" v-for="item in manytabledata"
         :key="item.attr_id"></el-form-item>
       </el-tab-pane>
       <el-tab-pane label="商品属性" name="2">商品属性</el-tab-pane>
       <el-tab-pane label="商品图片" name="3">商品图片</el-tab-pane>
       <el-tab-pane label="商品内容" name="4">商品内容</el-tab-pane>
     </el-tabs>
     </el-form>
   </el-card>
 </div>
</template>

<script>
export default {
  name: 'Add',
  data () {
    return {
      activeindex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: []
      },
      addFormrules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      catelist: [],
      cateprops: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manytabledata: []
    }
  },
  created() {
    this.getcatelist()
  },
  methods: {
    async getcatelist () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
      }
      this.catelist = res.data
    },
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforetableave (activename, oldactivename) {
      if (oldactivename === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请检查选项')
        return false
      }
    },
    async tabclick () {
      if (this.activeindex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateid}/attributes`,
          { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败')
        }
        this.manytabledata = res.data
      }
    }
  },
  computed: {
    cateid () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
  .bzt{
    margin: 20px 0;
  }
</style>
